Gas silencer having gas flow ducts defined by tubular rings within a casing



July .27, 1965 H. K. LElSTRlTZ 3,196,973

GAS SILENCER HAVING GAS FLOW DUCTS DEFINED BY TUBULAR RINGS WITHIN A CASING Filed March 29, 1961 FIG. I.

INVENTUR HANS KARL LEISTI UTZ ATTORN-ff Y.

United States Patent 3,196,978 GAS SILENCER HAVING GAS FLGW DUCTS DE- FTNED BY TUBULAR RHNG WITHIN A CASING Hans Karl Leistritz, Usingerstr. 10, Frankfurt am Main, Germany Filed Mar. 29, 1961, Ser. No. 9%,136 6 flairns. (Cl. 181-56) The present invention relates to a silencer for flowing media with a tube-ring.

The range of application of the present invention pertains to a silencer for flowing media and in particular not only for exhaust gases of internal combustion engines, but, first of all, also for the discharge of pressurized air of a great volume, as it is usual, for instance, in connection with circular piston blowers. In addition, stationary silencers of any size, as well as the discharge openings of turbines are a preferred area of application of the present invention.

It is one object of the present invention to provide a silencer for flowing media with a tube-ring, wherein the basic element resides in an endless tube in the shape of a tube-ring, which is disposed in conical, cylindrical or oval expansions and spreading-chambers, respectively, of suction or discharge conduits, which has entrance and discharge o-penings, and wherein the chamber defined by the inner Walls of the tube-ring, which is called below inner chamber of the tube-ring, has to perform special tasks as a passing chamber, in connection with the surrounding jacket chamber. In this manner, the tube-ring i not identical with the different tube conduits, which is found in the prior art. This does not exclude, that certain interference phenomena of a high degree occur in the present tube-ring. It is, however, essential, in distinction to a tube-ring, as it is shown, for instance, in the French Patent No. 1,194,- 562 in FIG. 1, that the tube-ring of the present structure is constructed of a form which can be disposed in the conventional silencers of smallest size and that its function is always in a non-separable relation to the task of the surrounding jacket body and to the inner chamber defined by the inner walls of the tube-ring.

With these and other objects in view which will become apparent in the following detailed description, the present invention will be clearly understood in connection with the accompanying drawings, in which:

PEG. 1 is a section taken in a plane extending through the center line of the tube-ring; and

FIG. 2 is an axial section of another embodiment of the combination.

Referring now to the drawing, and in particular to FIGS. 1 and 2, these embodiments have a joint basic concept, by disposing a plurality of tube-rings closely towards each other, so that the inner chambers define a continuous center channel. This arrangement brings about an extremely sound-free gas entrance chamber, if this center channel is used for the gas entrance.

Referring now to FIG. 1, this figure shows an embodiment in which the gas stream enters at the entrance branch 8 in a center channel formed by three tube-rings 1 which center channel is closed up by a wall 18 The gas enters through the openings 12 into the tube-rings 11 and is dischargeed through the openings 12:2 and reaches through an annular nozzle-like chamber 13 and passes through a tube 14 which constitutes the first step of an acoustic chain conduit in the chamber 19 whereupon the gas flows through a tube 2& into the free atmosphere.

' Referring now to FIG. 2, the best effects on the motor output result when the tube-ring chain, surrounded by a closely engaging jacket body lla or a ring-nozzle-like jacket chamber, consists of tube-rings 2 of which, seen in down-stream direction, each following tube-ring is larger in cross-section or volume than the previous one.

All tube-rings can be formed in their smallest crosssections not only as a circular face, but also rectangular or even oval. The use of round or oval tube-rings is preferred because the material stress and thereby the freedom from sound of the body is better in these cases. Tube-rings of rectangular or square cross-section are easier to manufacture, since they can be formed with simple covers which have overlapping edges in series and as parts, which can be disassembled, and can be screwed together.

In many instances it is suitable to use a tube-ring within the framework of one of the above-described structures, preferably, however, in accordance with an acoustic chain conduit as the last silencer unit. From the next to the last silencer unit which is formed mostly a a chamber, in which tubes lead into and out, a tube or an opening lead into a tube-ring from which a long extending discharge channel leads into the free atmosphere. This channel can be closed up by a Wall on the end opposite to that of the tube-ring, through which wall a tube open on both sides leads through.

While I have disclosed two embodiments of the present invention, it is to be understood that these embodiments are given by example only and not in a limiting sense, the scope of the present invention being determined by the objects and the claims.

I claim:

1. A gas silencer comprising a plurality of contiguous tubular rings enclosed within the walls of a casing and defining a central duct through said rings and an outer annular duct between at least all less one of said rings and the casing,

the hollow interior of each ring communicating through openings in its opposite side walls with the central duct and the outer annular duct,

one end of the central duct and one end of the outer annular duct being closed, and

the other ends of said ducts being connected to a gas inlet and a gas outlet, respectively, of the silencer.

2. A gas silencer, comprising a plurality of contiguous tubular rings enclosed within the walls of a casing and defining a central duct through said rings and an outer annular duct between at least all less one of said rings and the casing,

the hollow interior of each ring communicating through openings in its opposite side walls with the central duct and the outer annular duct,

one end of the central duct and one end of the outer annular duct being closed, and

the other ends of said ducts communicating with the outside of said casing.

3. The gas silencer, as set forth in claim 2, in which the tubular rings are connected directly together.

4. The gas silencer, as set forth in claim 2, in which each subsequent ring in the direction of the gas flow is of a larger cross-section than the one immediately preceding it.

5. The gas silencer, as set forth in claim 2 wherein at least one partition is arranged within the casing in the direction of sound propagation behind said tubular rings, and

a conduit leading through this partition into an enclosure having a second conduit which serves as a gas outlet.

6. The gas silencer, as set forth in claim 5, in which the inlet and the outlet conduits of the enclosure over lap.

(References on following page) 41 4 References Cifiedl by the Examiner FOREIGN PATENTS U 1,041,034 5/53 France. UNITED STATLJS PATENTS 1,226,438 2/60 France 1,242,219 10/ 17 McElroy 18158 466,712 5/37 Great Britain, 2,132,425 10/38 List 1 4 5 548,710 10/42 Great Britain. 2,720,935 10/55 Lysholm et a1 181-35 2,721,613 55 Hopkins 1 1 43 LEO SMILOW, Primary Examiner.

2,810,449 10/57 Coleman 1 c. W. ROBINSON, Examiner. 

2. A GAS SILENCER, COMPRISING A PLURALITY OF CONTIGUOUS TUBULAR RINGS ENCLOSED WITHIN THE WALLS OF A CASING AND DEFINING A CENTRAL DUCT THROUGH SAID RINGS AND AN OUTER ANNULAR DUCT BETWEEN AT LEAST ALL LESS ONE OF SAID RINGS AND THE CASING, THE HOLLOW INTERIOR OF EACH RING COMMUNICATING THROUGH OPENINGS IN ITS OPPOSITE SIDE WALLS WITH THE CENTRAL DUCT AND THE OUTER ANNULAR DUCT, 